[Interpreter] Adds support to fetch return value on break at return.

src/runtime/runtime-debug.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/runtime/runtime-utils.h"
 
 #include "src/arguments.h"
 #include "src/debug/debug.h"
 #include "src/debug/debug-evaluate.h"
 #include "src/debug/debug-frames.h"
 #include "src/debug/debug-scopes.h"
 #include "src/frames-inl.h"
 #include "src/isolate-inl.h"
 #include "src/runtime/runtime.h"
 
 namespace v8 {
 namespace internal {
 
 RUNTIME_FUNCTION(Runtime_DebugBreak) {
   SealHandleScope shs(isolate);
-  DCHECK(args.length() == 0);
+  DCHECK(args.length() == 1);
   // Get the top-most JavaScript frame.
   JavaScriptFrameIterator it(isolate);
   isolate->debug()->Break(args, it.frame());
   return isolate->debug()->SetAfterBreakTarget(it.frame());
 }
 
 
 RUNTIME_FUNCTION(Runtime_HandleDebuggerStatement) {
   SealHandleScope shs(isolate);
   DCHECK(args.length() == 0);
@@ skipping 552 matching lines @@
   // frame or if the frame is optimized it cannot be at a return.
   bool at_return = false;
   if (!is_optimized && index == 0) {
     at_return = isolate->debug()->IsBreakAtReturn(it.frame());
   }
 
   // If positioned just before return find the value to be returned and add it
   // to the frame information.
   Handle<Object> return_value = isolate->factory()->undefined_value();
   if (at_return) {
-    StackFrameIterator it2(isolate);
-    Address internal_frame_sp = NULL;
-    while (!it2.done()) {
-      if (it2.frame()->is_internal()) {
-        internal_frame_sp = it2.frame()->sp();
-      } else {
-        if (it2.frame()->is_java_script()) {
-          if (it2.frame()->id() == it.frame()->id()) {
-            // The internal frame just before the JavaScript frame contains the
-            // value to return on top. A debug break at return will create an
-            // internal frame to store the return value (eax/rax/r0) before
-            // entering the debug break exit frame.
-            if (internal_frame_sp != NULL) {
-              return_value =
-                  Handle<Object>(Memory::Object_at(internal_frame_sp), isolate);
-              break;
-            }
-          }
-        }
-
-        // Indicate that the previous frame was not an internal frame.
-        internal_frame_sp = NULL;
-      }
-      it2.Advance();
-    }
+    return_value = isolate->debug()->get_return_value();
   }
 
   // Now advance to the arguments adapter frame (if any). It contains all
   // the provided parameters whereas the function frame always have the number
   // of arguments matching the functions parameters. The rest of the
   // information (except for what is collected above) is the same.
   if ((inlined_jsframe_index == 0) && it.frame()->has_adapted_arguments()) {
     it.AdvanceToArgumentsFrame();
     frame_inspector.SetArgumentsFrame(it.frame());
   }
@@ skipping 1023 matching lines @@
   return Smi::FromInt(isolate->debug()->is_active());
 }
 
 
 RUNTIME_FUNCTION(Runtime_DebugBreakInOptimizedCode) {
   UNIMPLEMENTED();
   return NULL;
 }
 }  // namespace internal
 }  // namespace v8